Semisleeve valve motor



Aug. 11, 1925.'

. 4 Sheets-'Sheet 5 Aug. 1l, 1925.

5 J. H. come S EMI SLEEVE VALVE MOTOR Filed March 31 Aug. 1l, 1925. n Y 1,549,297

' J. H; COYNE SEMISLEEVE lVALVE MOTOR me@ Maron s1. 1924 4 Sheets-sheet 4 v Innen To@ To 25E fwllwm Z may Concern, n

Be is lrnoiifn that l, .i einem Cornia.

, a citizen of the llniteiliates, residing; ai

Detroit, in the county of Weine and 'Filiale of Miohigan, have 'invened certain new and useful Improvements in Seniisleeve Valve liotors9 of which the following is a speeiieution.

This invenien relates lo the' so-e-illeli semi-sleeve motors eno. las its object an improved ineens for sealing he valves adjacent the ports.

Another feature of rho oozisizrneion. is Sie sepsralole pilot (resizing sed. between llie, crank oase easing a l alie engine liloelr for cenering ehe inner eylinfler with respect lo the outer block. 'lfhis rashes il; easier lo maire. the castings that go lo nialre nj;- lle power unit and also gives access-io the of the oranl Case for iiiii'ng somo of the opereing paris in place lielore the assembly is completed. This will oe more fully e1;- plaineil hereinafter.

In the drawings:

Fig. l is a vertical cross section o Jhe iinproved engine.

Fig. 2 is a. section taken on the line of Fig. l.

3 is a cross seotion ofone oi the cyl inders showing rho junk rin,n and ille retaining Ineens therefor.

Fig. l is a 'iragnienary perspective of she junk ring.

w. r 1 *ffl* 1g. o is a irsgnientary pian View or ille pilot casfmg taken on the line o'l i.'

Fig. o is a vertical Cross section rlirouggli portion. of the engine teken on lhe line oi Fig.

Figs. 7 and 8 are sectional details showing inoeliiierl forms oif junk rings.

'.lhe sii-celled semieleeve motor is not broadly new. Such a motor has heen previously huilt anilpu't ino operation oui it has been found relalivel] fliliioult 'to properly retain lle gases, for these escape between he port enel the slidingvalve,

A motoro'f this type is providecl with e oylinderlolocli a," provided 'with ehe usual waer jacket space o. the insei; cylinder head c, exhaust manifold il, ele. 1li pair of cylinder segments or semi-sleeves and gr are reciprooazed vertically by the connecting rods f1 snel g1. Fliese sliding oylinr'ler selD meiie wnirol lli-e inolrepori fr and 'the exhaust pori; 1I. 'lfhe eonneoing rods are suiraaly @meel to open and close the ports a 'ehe Iproper times.

'lliese semieleei'e.valves reciprocaie hetween an outer cylinder j and a Water cooledinner cylinder JJ. New it is necessary to aeeuraely seatv the inner cylinder wili respect to he outer Cylinder so met an absoiul'elji' accurate sii-ece, is oo'sainefl in order that the sleeves may not hindi, nor be too loose. Therefore, in'order to center ehe inner eylin'rler, a. Waller-cooled pilot web fm,

isziroriflorl. rlfliis wel), llforni-as a separate oasring :fr Fig. 5). r:Chis casting; n is dowle l by the dowels o into he upper engine hloelecasing so as to he absolutely acouiazelj: hired. with respectio he eastiiiY so is to noyer-lj; Center ille inner oyll s. Cap run through the casting n. inlo the oranl; oase oasing g. Suitalile peeking fr is liteil onto either side of ille casting n. in orrler io ineke definite re'l'erence to this casting fo, l shall call it the pilot casting. l is li'ried in loeween'the upper and lower niain castings of the engine in nineh the seine way a gasket would he, hut carries the Waiter-cooled brifige m, which .is provided u'irh a pilot opening `for each. cylinder il'. 'l'hese cylinders 7s are properl;` cenlerecl wih respect lo the engineblock at the top by means ol each cylinder head o. 'tihe weleer is circulated into the pilo eastings through the passegeways z (see Figs. 5 and cored out the thickened. portions l0 in the engine oloek casting.

l'n order to sueeessfullyseal the valves el; ille ports, I jproi'ille large j unlr rings s. The junk ring liis into a large recess or socket 15 in ythe inner cylinder and the junk ring forms quite a large part of the sliding surface on which the two semi-sleeves slide. There is one junk ring il'or each cylinder. Each junk ring; is in the Yforni of a large split spring ring. inner cylinder preferably through the perforation Iv which runs through the junk ring at its meeting ends, as shown in Fig. Ll. lhis retains the juulr ring from turning around und causes the openlngs 'w end y of the exhaust and intake ports respectively to properly register with the corresponding openings in rhe inner cylinder.

There is used in conneeion with this juni; ring a smell end thrust ring er, or who@ A screw stud-u is screwed into thev might be termed a Wedging ring. This ring has a beveled upper surface that engages the beveled lower surface oli' the junk ring. Inasmuch as this ring tends to open out, it thrusts the junk ring tightly up against the top of its socket or seat and the Wedging or end thrust ring itself croivds in at the bottom of the seat to gas-seal the ring at the bottom; hence, gas cannot escape over the top or around the bottom of the junk ring.

It will be'noted that the Wedging ring w is placed at the bottom of the junk ring. The reason for this is that during the explosion stroke of the motor when the compression reaches its highest value, the tendencyv of the sliding semi-sleeves is to drag the junk ring upwardly. Thisis due to the fact that when the explosion takes lace the speed of the upwardly driven s eeve segment is considerably greater than the speed of the downwardly traveling sleeve segment, hence there is a differentialV action tending to drive the junk ring upwardly. By placing the wedging ring at the bot-tom, its spring pressure, together with this differential drag, both tend to seal the junk ring at its ends in the junk ring seat and thereby .make as tight a seal as possible against the gases when they are underthe highest coin pression. lf the wedging ring were placed `in the top of the junk ring the upward drag of the junk ring during the Working stroke of the motor would lessen the pressure of the wedgin ring' tending to seal the junk ring at boti ends. This therefore becomes an important factor in sealing the junk ring and preventing gases escaping from behind it.

With the improved separate pilot casting vwhich have described, the motor can be assembled Without much difficulty. The crank case casting is set up, the crank shaft is put in place together with the tivo valve operating shafts. The pistons, the connecting rods, and the valve-operating connecting rods are then secured to their respective shafts. rlhe inner cylinders are bolted to the pilot casting by ,the bolts l While the pilot casting is on the bench. The junk rings and the Wedging rings are'litted into their seats, thereupon the pilot casting, t o gether with the inner cylinders assembled in place can he dropped over the crank case casting by means 0i' a, suitable block and The Workman may then gradually drop and tit it over the pistons which are projecting upwardly. The semi-sleeves are then fitted around the inner cylinder and connected up with the sleeve operating connecting rods; thereupon the engine block casting can'be dropped over the sleeves and the inner cylinders by the aid of a block and tackle, the dovrei pins 0 accurately guiding the upper casting onto the pilot casting. The bolts r may then be inserted ing. The bolts l by which the inner cylinders are bolted to the pilot castings securely lock the inner cylinders to the pilot casting and with the interposed gasket 2, make a Water tight connection. It will thus be evident that With4 my improved pilot casting the assembly is much easier and better accomplished than lwould be otherwise.

Figs. 7 and 8 show modified forms of the junk ring. In Fig. 7 it is a split wedging ring -a at the top and bottom of the junk ring Whiehtends to thrust in both directions. In Fig. 8, a composite Wedging ring m-b is positioned at the top and bottom of the junk ring for the same purpose.

What I claim is:

l. In an internal combustion engine, the combination of an engine block provided with an outer cylinder having intake and exhaust passages, an inner cylinder provided with intake and exhaust ports registering with said passages, said inner cylinder spaced from the outer cylinder, semi-sleeve valves operating in said space for controlling said ports, and a-ported junk ring for sealing said valves with respect to the ports, said junk ring being sealed by thrust at both ends.

2. `In an internal combustion engine, the combination of an engine block provided With an outer cylinder having exhaust and intake passageways, an inner cylinder supported in spaced relation withv respect to the outer cylinder and having intake and exhaust ports registering with said passage- Ways, said inner cylinder provided with a junk ring seat, a sleeve valve structure provided With port openings therethrough and operating in the space between the cylinders andgoverning the said ports, and a junk ring located in said junk ring seatprovided with means for sealing itself in the seat at both ends of the ring and comprising a relatively large split ring having port openings registering with the port openings in the inner cylinder.

f3. ln an internal combustion engine, the combination of an engine block provided with an outer cylinder, an inner cylinder properly centered Within the outer cylinder and spaced therefrom, the outer cylinder and inner cylinder provided With registering ports and passageways, a sleeve valve structure provided with port openings and operating in said space, the inner cylinder heilig provided with a junk ring seat, a junk ring comprising a relatively large split ring having port openings registering with the ports in the inner cylinder and seated in said junk ring seat, and a ivedging ring fitted into one end of the junk ring for giving the junk ring end thrust and sealing both ends of the junk ring and seat.

4. In an internal combustion engine, the combination of an engine block provided' with an outer cylinder having exhaust and intake passageways, an inner cylinder supported in spaced relation with respect to the outer cylinder and provided With registerin intake and exhaust ports, semi-sleeve va ves operating in said space, a sealing ring for sealing the joint between the sliding semi-sleeves and the ports,A and additional means for giving such scaling ring end thrust; to prevent gases escaping behind said sealing ring at either end.

5. In an internal combustion engine, the combination of an engine bloclcprovided with an outer cylinder, a crank case, a separate pilot casting tilted in between the engine block and the crank case, and an inner cylinder havin its lower end removably fitted into the pilot casting for centering thelower end of the inner cylinder with respect to the outer cylinder in spaced relation.

6. In an internal combustion engine, an engine blockrprovided with an outer cylinder, a crank case castingwa pilot casting doweled into the engine block and fitted between the engine block and the crank case casting, said pilot casting Aprovided with pilot openin and inner cylinders centered in spaced 're ation with respect to the outer cylinders at their lower ende by having pilot portions removably fitted into the pilot openings of the 'pilot casting.

7 .i In an internal combustion engine, an

engine block casting provided with a plurality of outer cylinders, Ya crank case casting, a pilot casting secured between theengine block casting and the crank case casting and having an accurately :fitted Arelation with respect to the engine block casting,y the paid with water circulating space arranged to communicate with thewatcr jacket of the engine block, said pilot casting provided with pilot openings and said inner cylinders provided with pilot parts fitted into the said pilot openings and provided with water circulating space arranged tofcolnmunicate with the water circulating space of the pilot casting.

9. In an internal combustion engine, the combination of an engine block provided with an outer cylinder having exhaust and intake passages, aninner cylinder fitted in spaced relation with respect to the outer cylinder and having'ports registering with said passages, a sleeve valve structure reciprocating in the said space, a junk ring and junk ring seat, said junk ring arranged 4-to engage with the sleeve valve structure, the sleeve valve structure being arranged to opcrate so that there is an' upward drag on the junk ring during the explosion stroke, and an end-thrust ring crowding between the junk ring and its seat at thebottom of the junk ring.

In testimony .whereof I have aliixed my signature.

-JOHN HEBER COYNE. 

